Current Mode PWM Controller The UC2842AJ is a current-mode PWM controller manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:
### **Specifications:**
- **Topology:** Current-mode PWM controller
- **Input Voltage (VIN):** Up to 30V (operating range)
- **Output Drive Current:** ±1A (peak)
- **Switching Frequency:** Up to 500kHz
- **Duty Cycle Range:** 0% to 100%
- **Error Amplifier Bandwidth:** 1MHz
- **Reference Voltage (VREF):** 5V ±1%
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)
### **Descriptions:**
- The UC2842AJ is designed for offline and DC-DC converter applications.
- It provides precise duty cycle control with current-mode operation for improved loop response.
- Includes an undervoltage lockout (UVLO) feature with hysteresis for reliable startup.
- Suitable for flyback, forward, and boost converter designs.
### **Features:**
- **Current-Mode Control:** Enhances transient response and simplifies loop compensation.
- **Automatic Feed-Forward Compensation:** Improves line regulation.
- **Under-Voltage Lockout (UVLO):** Ensures proper startup and shutdown.
- **Cycle-by-Cycle Current Limiting:** Protects against overcurrent conditions.
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference.
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.
- **Low Startup Current:** Typically 0.5mA for efficient operation.
This information is based on TI's official datasheet for the UC2842AJ. For detailed application notes or design considerations, refer to the manufacturer's documentation.
